Bull. Natl. Mus. Nat. Sci., Ser. A, 35(1), pp. 55–71, March 22, 2009 Arge indicura n. sp. Feeding on Potentilla and Sanguisorba (Insecta, Hymenoptera, Argidae) from Japan Akihiko Shinohara1 and Hideho Hara2 1 Department of Zoology, National Museum of Nature and Science, 3–23–1 Hyakunin-cho, Shinjuku-ku, Tokyo, 169–0073 Japan E-mail:
[email protected] 2 Hokkaido Forestry Research Institute, Koshunai, Bibai-shi, Hokkaido, 079–0198 Japan E-mail:
[email protected] Abstract A new argid sawfly, Arge indicura, is described from Japan. It was identified with Arge nigrovaginata Malaise, 1931, described from the Russian Far East, for more than seven decades, but a recent examination of Malaise’s type material has revealed the misidentification. Previously unknown immature stages are described, new host plant records are given, and the distribution and life history are discussed based on the specimens examined and rearing experiments. The mostly greenish, solitary and cryptic larvae feed on the leaves of Potentilla and Sanguisorba (also Fra- garia and Duchesnea in the laboratory), all belonging to the clade Sanpotina of the Rosaceae. Arge indicura probably has three generations a year in the lowland of central Honshu. Key words : Argidae, Arge indicura, new species, Potentilla, Sanguisorba. In the course of our revisionary works on the Our examination of the holotype of Arge pa- sawfly genus Arge of Japan and adjacent regions, gana var. nigrovaginata has revealed that the we have found that the Japanese species previ- Japanese species does not belong to Malaise’s ously determined as Arge nigrovaginata Malaise, taxon.